how to show seller ratings with Google Shopping results?

We are a marketplace. We have a google merchant multi-client account. we store reviews of the sellers with us. We are sending revewUrl of seller in content api when we create google merchant sub-account for a seller.

But in seller ratings column, it shows "No Rating" even though he has ratings available at http://www.truegether.com/feedback/laptoptree.html. Please help us so we can show ratings of our sellers on Google Shopping. When we contacted Content API team, they told us that we need a google trusted account. But when we contacted Google Trusted account team, they told us that it is not a requirement for the marketplaces. Thanks!